Telephone-transmitter.



No. 738,857 PATENTED SEPT. 15 1903. H'. D. STROUD.

TELEPHONE TRANSMITTER.

APPLICATION FILED .TU'LX 2 54,1901.

10 MODEL.

W4 yjfim.

' iv @mm UNITED STATES Patented September 15, 1903.

PATENT OFFICE.

TELEPHONE-TRANSMITTER.

SPECIFICATION forming part of Letters Patent No. 738,857, dated September 1 5, 1903.

Application filed July 25, 1901. Serial No. 69,733- (No model.)

To all whom it may concern.-

Be it known that I, HAROLD D. STROUD, of Chicago, State of Illinois, have invented anew and useful Improvement in Telephone-Trans 5 mitters, of which the following is a specification.

This invention relates to a means of stopping or controlling the vibrations of the transmitter-diaphragm at the will of the person [0 using the telephone, and the object of so doing is to eliminate the disturbance due to foreign sounds in the vicinity of the telephone, which tend to make hearing difficult, especially when the telephone is placed in a noisy location.

For a clear understanding of the improvement I will refer to the complementary drawing, showing a central section of atelephonetransmitter with my improvement attached,

in which A represents the front part and frame of the transmitter, B the diaphragm,

and O the button, which is preferably of hard rubber or compressed fiber, having a spindle and an enlargement on the outer side for 2 5 the finger and a pin through the spindle on the inside of the transmitter-front to hold it in place. There is a spiral spring between the front of the transmitter and the fingerbutton to hold the button normally out of contact with the diaphragm. When the button is pressed, its inner end is brought in gentle contact with the diaphragm and stops its vibrations, thus quieting the transmitter and makinghearing more distinct. This but- 3 5 ton must only be pressed when listening and not when talking. I have thus provided a push-button or equivalent damping element that reciprocates and is normally out of operative relation or contact with the diaphragm, 40 preferably by being removed entirely therefrom. The most common means now and mitter of all or most of the current upon which it depends for its action. Such an arrangement is not economical because of the great amount of current which flows through the shunt-current. Also as electrical contacts are used they are liable to get dirty from disuse and cause scratching noises in the circuit. Again, such buttons are seldom found in the same place on any two forms of telephones, and the telephone users become confused and rarely learn the Value of them. My improvement contemplates locating them upon the transmitter where people can always find them, and in consequence better service may be given.

I have shown one particular type of transmitter and a push-button in association therewith of a particular form; but I do not wish to be limited to the precise details of construction illustrated.

I claim as my invention-- 1. The combination with a telephone-transmitter of a push-button normally out of operative contact with the transmitters diaphragm, adapted to be pressed into operative 7o engagement with the diaphragm of the trans mitter, substantially as described.

2. The combination with a telephone-transmitter, of a push-button adapted to be pressed into engagement with the diaphragm, and 7 5 means for normally maintaining the pushbutton out of operative relation with the diaphragm of the transmitter, substantially as described. I

3. The combination with a telephone-trans- 8o mitter, of apush-button adapted to be pressed into engagement with the diaphragm, and a spring engaging the push button and normally serving to maintain the same out of contact with the diaphragm, substantially as 8 5 described.

HAROLD D. STROUD.

Witnesses:

Lewis B. Pnnnrrss, F. N. RE QUA. 

